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Install kubectl

Windows

  1. Download the latest release v1.14.0 from this link: https://storage.googleapis.com/kubernetes-release/release/v1.14.0/bin/windows/amd64/kubectl.exe

    Or if you have curl installed, use this command:

    curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.14.0/bin/windows/amd64/kubectl.exe

  2. Add the binary in to your PATH.

  3. Test to ensure the version you installed is up-to-date:

    kubectl version

Linux

  1. Download the latest release v1.14.0

    curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.14.0/bin/linux/amd64/kubectl

  2. Make the kubectl binary executable.

    chmod +x ./kubectl

  3. Move the binary in to your PATH.

    sudo mv ./kubectl /usr/local/bin/kubectl

  4. Test to ensure the version you installed is up-to-date:

    kubectl version

Mac

  1. Download the latest release v1.14.0

    curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.14.0/bin/darwin/amd64/kubectl

  2. Make the kubectl binary executable.

    chmod +x ./kubectl

  3. Move the binary in to your PATH.

    sudo mv ./kubectl /usr/local/bin/kubectl

  4. Test to ensure the version you installed is up-to-date:

    kubectl version

Official installation manual

https://kubernetes.io/docs/tasks/tools/install-kubectl/

Kubernetes files location

src/kubernetes

Create namespace

  1. Open file 00-namespace.yml
  2. Define your own namespace by replacing <namespace>.
  3. Create namespace: kubectl apply -f 00-namespace.yml

Pods

Deploy pod

kubectl apply -f 01-pod.yml

Check pod status

kubectl get pods -n <namespace>

Access your application via port forwarding

Application will be available on localhost:12345

kubectl port-forward helloworld 12345:8080 -n <namespace>

Delete pod

kubectl delete pod helloworld -n <namespace>

Services

Deploy a service and access application via port forwarding to service

kubectl port-forward service/helloworld-service 12345:8080 -n <namespace>

Deployment

Scale a deployment

kubectl scale deployment/helloworld --replicas=3

Update a deployment with another image version

kubectl set image -n <namespace> deployment/<deployment-name> <container-name>=<image>:<tag>

kubectl set image -n <namespace> deployment/helloworld helloworld=gcr.io/workshop-bielefeld/helloworld:1.0.1

ConfigMaps

Dry run of creating config map from literal

kubectl create configmap special-config --from-literal=special.how=very --dry-run -o yaml

Dry run of creating config map from file

kubectl create configmap special-config --from-file=application.properties --dry-run -o yaml

Secrets

Dry run of creating a secret

kubectl create secret generic db-user-pass --from-literal=username=user --from-literal=password=123456 -o yaml --dry-run

Access Dashboard

Start proxy kubectl proxy

Open localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:https/proxy/ in browser

Get Token

kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')

Copy&paste token for authetication